Don't include the tracing in gpu_memory_buffer.h

ui/gfx/gpu_memory_buffer.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace gfx {
 
-base::trace_event::MemoryAllocatorDumpGuid GetGpuMemoryBufferGUIDForTracing(
-    uint64_t tracing_process_id,
-    GpuMemoryBufferId buffer_id) {
-  // TODO(ericrk): Currently this function just wraps
-  // GetGenericSharedMemoryGUIDForTracing, we may want to special case this if
-  // the GPU memory buffer is not backed by shared memory.
-  return gfx::GetGenericSharedMemoryGUIDForTracing(tracing_process_id,
-                                                   buffer_id);
-}
-
 GpuMemoryBufferHandle::GpuMemoryBufferHandle()
     : type(EMPTY_BUFFER), id(0), handle(base::SharedMemory::NULLHandle()) {
 }
 
 GpuMemoryBufferHandle::GpuMemoryBufferHandle(
     const GpuMemoryBufferHandle& other) = default;
 
 GpuMemoryBufferHandle::~GpuMemoryBufferHandle() {}
 
 void GpuMemoryBuffer::SetColorSpaceForScanout(
     const gfx::ColorSpace& color_space) {}
 
 }  // namespace gfx